These CSS tweaks are for higher density display for Uptime Kuma status pages in dark mode.

Uptime-Kuma-Status-Page-Dark-Mode-High-Density-Tweaks.css

:root {
  --min-item-width: 28ch;
  --max-item-width: .5fr;
  --grid-spacing: .25rem;
  --item-padding: .25rem;
}

/* Let items expand on small screens */
@media (max-width: 600px) {
  :root {
    --max-item-width: 1fr;
  }
}

/* Cap item width for better appearance on large screens */
@media (min-width: 2560px) {
  :root {
    --max-item-width: 300px;
  }
}

/* Readability on 4K screens at distance */
@media (min-width: 3840px) {
  .item-name {
    font-size 1.3em;
    font-weight: 700;
    letter-spacing: 0.8px;
  }
  .badge {
    font-size: .9em;
  }
  .wrap > .d-flex {
    font-size: .9em;
    font-weight: 500;
    letter-spacing: .8px;
  }
}

/* Expand container */
.container {
  max-width: 98%
}

/* Grid layout */
.monitor-list > .monitor-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(var(--min-item-width), var(--max-item-width)));
  grid-gap: var(--grid-spacing);
}

.item {
  width: 100%;
  padding: var(--item-padding) !important;
  border: #3d3d3d solid 2px;
}

.item > .row {
  flex-direction: column;
}

.row > div {
  width: 100%;
}

/* Text readability */
.item-name {
  color: #f1f1f1;
}

/* Badge movement */
.row {
  position: relative;
}
body:not(.mobile) .badge {
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
}

/* Header compacting */
.main {
  position: relative;
}
.overall-status {
  padding: .5rem !important;
}
body:not(.mobile) .overall-status {
  position: absolute;
  top: 0;
  right: 0;
  width: 50%;
}

/* Tweaks for mobile size */
body.mobile {}

/* Footer compacting */
footer .alert-heading {
  padding: 0 !important;
}

/* Margin resets */
.mb-4, .mb-5 {
  margin-bottom: .5rem !important;
}

.mt-4 {
  margin-top: .5rem !important;
}
  
.mt-5 {
  margin-top: 0 !important;
}


/* Reduce glaring blue maintenance color */
.bg-maintenance {
  background-color: #4962bd !important;
}

Some Tweaks ans Aesthetics added!

`:root {
--min-item-width: 320px;
--grid-spacing: 1rem;
--item-padding: 1rem;
--bg-dark: #0f0f0f;
--bg-card: #1a1a1a;
--text-color: #eaeaea;
--accent-color: #3ddc84;
--danger-color: #ff4d4d;
--maintenance-color: #ff9900;
--border-color: #2e2e2e;
--hover-color: #232323;
--transition-fast: 0.2s ease-in-out;
}

body {
background-color: var(--bg-dark);
color: var(--text-color);
font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

/* Header compacting */
.main {
position: relative;
}
.overall-status {
padding: .5rem !important;
}
body:not(.mobile) .overall-status {
position: absolute;
top: 0;
right: 0;
width: 50%;
}

/* Readability on 4K screens at distance */
@media (min-width: 3840px) {
.item-name {
font-size 1.3em;
font-weight: 700;
letter-spacing: 0.8px;
}
.badge {
font-size: .9em;
}
.wrap > .d-flex {
font-size: .9em;
font-weight: 500;
letter-spacing: .8px;
}
}

/* Container Setup */
.container {
max-width: 95%;
margin: auto;
}

/* Grid layout: 2 per row desktop, 1 on mobile */
.monitor-list > .monitor-list {
display: grid;
grid-template-columns: repeat(auto-fit, minmax(var(--min-item-width), 1fr));
gap: var(--grid-spacing);
}

/* Card Design */
.item {
background-color: var(--bg-card);
border-radius: 14px;
border: 1px solid var(--border-color);
padding: var(--item-padding);
box-shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
display: flex;
flex-direction: column;
justify-content: space-between;
transition: transform var(--transition-fast), background-color var(--transition-fast);
}
.item:hover {
background-color: var(--hover-color);
transform: translateY(-4px);
}

/* Title */
.item-name {
font-size: 1.1rem;
font-weight: 600;
text-align: center;
color: var(--text-color);
margin-bottom: 0.5rem;
}

/* Uptime/Status Badge */
.badge {
font-size: 0.75rem;
background-color: #2a2a2a;
color: var(--text-color);
padding: 0.4rem 0.6rem;
border-radius: 6px;
display: inline-block;
margin-top: 0.5rem;
align-self: flex-end;
margin-left: auto;
}

/* Info rows (ping, time, etc.) */
.row {
display: flex;
justify-content: space-between;
align-items: center;
flex-wrap: wrap;
font-size: 0.9rem;
gap: 0.5rem;
margin-top: 0.75rem;
}
.row > div {
flex: 1 1 45%;
text-align: center;
}

/* Status bar */
.status-bar {
display: flex;
width: 100%;
height: 8px;
border-radius: 6px;
overflow: hidden;
background-color: #333;
margin-top: 1rem;
}
.status-bar .up {
background-color: var(--accent-color);
flex: 1;
}
.status-bar .down {
background-color: var(--danger-color);
flex: 1;
}
.status-bar .maintenance {
background-color: var(--maintenance-color);
flex: 1;
}

/* Footer + header minimal */
header, footer {
background-color: #111;
color: var(--text-color);
}
footer .alert-heading {
padding: 0.5rem !important;
}

/* Mobile Tweaks */
@media (max-width: 768px) {
.monitor-list > .monitor-list {
grid-template-columns: 1fr;
}

.row {
flex-direction: column;
}

.row > div {
flex: 1 1 100%;
}

.badge {
align-self: center;
}

.status-bar {
height: 6px;
}
}
`